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		<h1 class="page-title">Source: utils/observable-emit.js</h1>
    
<section>
    <article>
        <pre
            class="sunlight-highlight-javascript linenums">const Observable = function () {
    this.Events = {}
    this.__cnt = 0
  }

  Observable.hasOwnKey = Function.call.bind(Object.hasOwnProperty)

  Observable.slice = Function.call.bind(Array.prototype.slice)

  /**
   * 事件分发
   * @param eventName
   * @param callback
   * @param context
   * @returns {(*|*)[]}
   */
  Observable.prototype.on = function (eventName, callback, context) {
    return (this.bindEvent(eventName, callback, 0, context))
  }

  /**
   * 取消监听
   * @param event
   * @returns {boolean}
   */
  Observable.prototype.un = function (event) {
    var eventName = ''
    var key = ''
    var r = false
    var type = typeof event
    var that = this
    if (type === 'string') {
      if (Observable.hasOwnKey(this.Events, event)) {
        delete this.Events[event]
        return true
      }
      return false
    } else if (type === 'object') {
      eventName = event[0]
      key = event[1]
      if (Observable.hasOwnKey(this.Events, eventName) &amp;&amp; Observable.hasOwnKey(this.Events[eventName], key)) {
        delete this.Events[eventName][key]
        return true
      }
      return false
    } else if (type === 'function') {
      that.eachEvent(that.Events, function (keyA, itemA) {
        that.eachEvent(itemA, function (keyB, itemB) {
          if (itemB[0] === event) {
            delete that.Events[keyA][keyB]
            r = true
          }
        })
      })
      return r
    }
    return true
  }

  /**
   * 事件监听（只触发一次）
   * @param eventName
   * @param callback
   * @param context
   * @returns {(*|*)[]}
   */
  Observable.prototype.once = function (eventName, callback, context) {
    return (this.bindEvent(eventName, callback, 1, context))
  }

  /**
   * 响应事件
   * @param eventName
   * @param args
   */
  Observable.prototype.action = function (eventName, args) {
    if (Observable.hasOwnKey(this.Events, eventName)) {
      this.eachEvent(this.Events[eventName], function (key, item) {
        item[0].apply(item[2], args)
        if (item[1]) {
          delete this.Events[eventName][key]
        }
      })
    }
  }

  /**
   * 实时触发响应
   * @param eventName
   */
  Observable.prototype.dispatch = function (eventName) {
    var that = this
    var args = Observable.slice(arguments, 1)
    setTimeout(function () {
      that.action(eventName, args)
    })
  }

  /**
   * 延后触发响应
   * @param eventName
   */
  Observable.prototype.dispatchSync = function (eventName) {
    this.action(eventName, Observable.slice(arguments, 1))
  }

  /**
   * 清空发布中心
   */
  Observable.prototype.clear = function () {
    this.Events = {}
  }

  /**
   * 绑定事件
   * @param eventName
   * @param callback
   * @param isOne
   * @param context
   * @returns {[*,*]}
   */
  Observable.prototype.bindEvent = function (eventName, callback, isOne, context) {
    if (typeof eventName !== 'string' || typeof callback !== 'function') {
      throw new Error('传入的事件名称和回调函数有误！')
    }
    if (!Observable.hasOwnKey(this.Events, eventName)) {
      this.Events[eventName] = {}
    }
    this.Events[eventName][++this.__cnt] = [callback, isOne, context]
    return [eventName, this.__cnt]
  }

  /**
   * 循环触发事件
   * @param obj
   * @param callback
   */
  Observable.prototype.eachEvent = function (obj, callback) {
    for (var key in obj) {
      if (Observable.hasOwnKey(obj, key)) {
        callback(key, obj[key])
      }
    }
  }

  export default Observable</pre>
    </article>
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